Please provide a diagram of hepatitis B infection showing the timing of appearance and disappearance of the viral antigens and corresponding antibodies.

Hepatitis B Infection: Serologic Markers Timeline

The appearance and disappearance of hepatitis B antigens and antibodies follows a predictable temporal pattern that is essential for diagnosis and monitoring. 1

Acute Hepatitis B Infection Timeline

Early Phase (0-6 weeks post-exposure)

• HBV DNA appears first, detectable 10-20 days before HBsAg 2
• HBsAg becomes detectable at average 30 days (range: 6-60 days) after exposure 2
• HBsAg is the only marker present during the first 3-5 weeks 2

Active Infection Phase (1-6 months)

• Anti-HBc (IgM and IgG) appears 1-2 weeks after HBsAg detection 1
• HBeAg appears during active viral replication, indicating high infectivity 1
• HBsAg persists throughout acute infection
• IgM anti-HBc remains detectable for up to 6 months 1

Recovery Phase (3-6 months)

• HBsAg disappears typically 4-6 months after infection onset 3
• Anti-HBe appears as viral replication decreases 1
• "Window period" may occur: HBsAg negative but anti-HBs not yet detectable; only anti-HBc IgM is present 3
• Anti-HBs develops typically within 3-4 months after HBsAg clearance 1

Long-term (>6 months)

• IgG anti-HBc persists for life 1
• Anti-HBs indicates immunity and persists long-term 1
• IgM anti-HBc becomes undetectable within 6 months 1

Chronic Hepatitis B (>6 months HBsAg positive)

If HBsAg persists beyond 6 months, spontaneous clearance is unlikely and infection is deemed chronic 1

Chronic Infection Markers:

• HBsAg remains positive indefinitely
• Total anti-HBc positive (IgG predominates)
• IgM anti-HBc negative (unless acute exacerbation)
• Anti-HBs negative
• HBV DNA positive 1

HBeAg Status in Chronic Infection:

• HBeAg-positive: High viral replication (typically >20,000 IU/mL) 4
• HBeAg-negative with anti-HBe: Lower viral replication (often 2,000-20,000 IU/mL) 4

Key Serologic Patterns Summary Table

Marker	Acute Infection	Recovery	Chronic Infection	Vaccination
HBsAg	Positive	Negative	Positive	Negative
Anti-HBs	Negative	Positive	Negative	Positive
Total anti-HBc	Positive	Positive	Positive	Negative
IgM anti-HBc	Positive	Positive/Negative	Negative	Negative
HBV DNA	Positive	Negative	Positive	Negative

1

Critical Clinical Pearls

Common pitfalls to avoid:

1. Transient HBsAg positivity can occur up to 18 days post-vaccination (52 days in hemodialysis patients) and is clinically insignificant 1

2. Isolated anti-HBc (only marker present) can represent:

   • Resolved infection with waned anti-HBs
   • Occult chronic infection (HBV DNA detectable in <10% of cases)
   • False-positive result 1

3. Window period diagnosis: During the serologic window when both HBsAg and anti-HBs are negative, anti-HBc IgM is the only detectable marker and confirms acute infection 3

4. Vaccination vs. natural immunity: Anti-HBs alone (without anti-HBc) indicates vaccine-derived immunity; both anti-HBs and anti-HBc indicate natural infection recovery 1

5. HBeAg presence correlates with high viral replication and increased infectivity, while anti-HBe generally indicates lower viral replication 1